Learning to forgive, truly forgive, is like a balancing act of strength and meditation. It can be an exercise in prayer. You have to stretch those forgiving muscles and work them, building up strength.
Forgiving those who have hurt us is perhaps one of the best things we can do for ourselves. Maybe they don't deserve it but you deserve that peace.
For me it starts with a hesitant prayer of forgiveness but as the months go by I am filled with peace and even love towards the one I am forgiving.